2111031220 has 48 divisors (see below), whose sum is σ = 4591838160. Its totient is φ = 814263296.

The previous prime is 2111031187. The next prime is 2111031227. The reversal of 2111031220 is 221301112.

It can be written as a sum of positive squares in 8 ways, for example, as 525876624 + 1585154596 = 22932^2 + 39814^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2111031220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111031227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585744 + ... + 589336.

It is an arithmetic number, because the mean of its divisors is an integer number (95663295).

Almost surely, 2^2111031220 is an apocalyptic number.

2111031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2111031220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2295919080).

2111031220 is an abundant number, since it is smaller than the sum of its proper divisors (2480806940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2111031220 is a wasteful number, since it uses less digits than its factorization.

2111031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4644 (or 4642 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2111031220 is about 45945.9597788532. The cubic root of 2111031220 is about 1282.8175280619.

Adding to 2111031220 its reverse (221301112), we get a palindrome (2332332332).

The spelling of 2111031220 in words is "two billion, one hundred eleven million, thirty-one thousand, two hundred twenty".